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Starter Motor

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gcostabile(at)embarqmail.
Guest

Posted: Sun Mar 22, 2009 10:40 am Post subject: Starter Motor

Had my starter fail this week and had a ton of help from the Chapter 108 EAA gang trying to get me airborne again.  Had my starter side-by-side with a loaner and found both starters have nine tooth pinion gears.  However, the pinion gear diameter for my starter was about 3 inches, while the pinion gear diameter for the loaner was about 2.5 inches (as measured with calipers).  If you have the starters side-by-side the difference in diameter is easily visible.  My engine has a 122 tooth gear ring.  So we should be able to conclude the 149 tooth gear ring configuration requires a starter with about a 2.5 inch diameter pinion gear, while the 122 tooth gear ring requires a starter with about a 3 inch diameter pinion gear.  Hope this helps.  

   

Gregg Costabile  

RV-6, 1201 hours  

O-320-A1A, fixed pitch Aymar Demuth  

   

           

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"H.Ivan   Haecker" <baremetl(at)gvtc.com>         	  Quote: 	
		   	
          

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Starter Motor         	  Quote: 	
		   	
          

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Feb   12, 2005         	  Quote: 	
		     I need to know how to tell if a particular 12 volt Prestolite starter motor isused with a 122 or a 149 tooth ring gear. The motor in question has 9 teeth onits drive gear and is stamped with the following:A/E  P/N  2041 	
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baremetl(at)gvtc.com
Guest

Posted: Sun Mar 22, 2009 7:41 pm Post subject: Starter Motor

Greg,

  

 Thanks for the info. I never did find the answer to  my question from 4 years ago until now. In fact, I had totally forgotten the  whole affair. I finally just bolted the starter I had on the engine and the  gears seemed to mesh so I went with that and had no problems. But thanks to you,  I now know how to tell the difference.

  

  

 Ivan Haecker    -4     1546 hrs.  S. Cen. TX  

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